Stockholders' Equity - Schedule of Stockholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2024	Jun. 30, 2023
Increase (Decrease) in Stockholders' Equity
Balance (in shares)			36,142,346				36,142,346
Balance	$ 163,925	$ 165,379	$ 161,533	$ 151,074	$ 154,953	$ 154,536	$ 161,533	$ 154,536
Balance (in shares)			5,433,045				5,433,045
Net income	6,000	5,709	$ 1,907	6,487	4,245	3,967	$ 13,616	$ 14,698
Exercise of common stock options, grants of restricted stock awards, and vesting of restricted stock units			127			495
Taxes paid associated with net settlement of stock compensation awards	(89)	(1,142)	(224)	(324)	(492)	(244)
Common stock repurchased	(373)	(7,907)	(1,171)	(4,268)	(9,814)	(7,199)
Common stock surrendered in the exercise of stock options (in shares)							0	(12,215)
Stock compensation expense	$ 2,617	2,343	2,249	2,195	1,939	2,126
Foreign currency translation and other				645	243	1,273
Balance (in shares)	36,525,606						36,525,606
Balance	$ 171,970	$ 163,925	$ 165,379	$ 155,809	$ 151,074	$ 154,953	$ 171,970	$ 155,809
Balance (in shares)	5,997,932						5,997,932
Common Stock
Increase (Decrease) in Stockholders' Equity
Balance (in shares)	36,476,363	36,189,758	36,142,345	36,049,718	35,899,640	35,724,057	36,142,345	35,724,057
Balance	$ 36	$ 36	$ 36	$ 36	$ 36	$ 36	$ 36	$ 36
Exercise of common stock options, grants of restricted stock awards, and vesting of restricted stock units (in shares)	53,921	353,069	59,471	87,515	184,791	190,119
Taxes paid associated with net settlement of stock compensation awards (in shares)	(4,678)	(66,464)	(12,058)	(21,671)	(34,713)	(14,536)
Balance (in shares)	36,525,606	36,476,363	36,189,758	36,115,562	36,049,718	35,899,640	36,525,606	36,115,562
Balance	$ 36	$ 36	$ 36	$ 36	$ 36	$ 36	$ 36	$ 36
Additional Paid-in Capital
Increase (Decrease) in Stockholders' Equity
Balance	269,297	268,096	265,945	262,118	260,653	258,275	265,945	258,275
Exercise of common stock options, grants of restricted stock awards, and vesting of restricted stock units			127			495
Taxes paid associated with net settlement of stock compensation awards	(89)	(1,142)	(224)	(324)	(492)	(244)
Common stock surrendered in the exercise of stock options					18
Shares swapped to exercise stock options				173
Stock compensation expense	2,617	2,343	2,249	2,195	1,939	2,126
Balance	271,825	269,297	268,096	$ 264,162	$ 262,118	$ 260,653	271,825	$ 264,162
Treasury Stock
Increase (Decrease) in Stockholders' Equity
Balance	$ (93,109)	$ (85,202)	$ (84,031)				$ (84,031)
Balance (in shares)	(5,975,690)	(5,501,737)	(5,433,045)	(5,096,341)	(4,345,018)	(3,813,199)	(5,433,045)	(3,813,199)
Balance				$ (79,586)	$ (69,754)	$ (62,554)		$ (62,554)
Common stock repurchased (in shares)	(22,242)	(473,953)	(68,692)	(325,410)	(749,903)	(531,819)
Common stock repurchased	$ (373)	$ (7,907)	$ (1,171)	$ (4,268)	$ (9,814)	$ (7,199)
Common stock surrendered in the exercise of stock options (in shares)					(1,420)
Common stock surrendered in the exercise of stock options					$ (18)
Shares swapped to exercise stock options (in shares)				(10,795)
Shares swapped to exercise stock options				$ (173)
Balance (in shares)	(5,997,932)						(5,997,932)
Balance	$ (93,482)	$ (93,109)	$ (85,202)				$ (93,482)
Balance (in shares)		(5,975,690)	(5,501,737)	(5,432,546)	(5,096,341)	(4,345,018)		(5,432,546)
Balance				$ (84,027)	$ (79,586)	$ (69,754)		$ (84,027)
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity
Balance	(9,957)	$ (9,500)	$ (10,458)	(8,769)	(9,012)	(10,285)	(10,458)	(10,285)
Foreign currency translation and other				645	243	1,273
Balance	(10,067)	(9,957)	(9,500)	(8,124)	(8,769)	(9,012)	(10,067)	(8,124)
Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity
Balance	(2,342)	(8,051)	(9,958)	(22,725)	(26,970)	(30,936)	(9,958)	(30,936)
Net income	6,000	5,709	1,907	6,487	4,245	3,967
Balance	$ 3,658	$ (2,342)	$ (8,051)	$ (16,238)	$ (22,725)	$ (26,970)	$ 3,658	$ (16,238)